Abstract
Due to the increasing number of wind power plants, several countries have modified their grid codes to include specific requirements for the connection of this technology to the power system. One of the requirements is the ride-through fault capability (RTFC), i.e., the system capability to sustain operation during voltage sags. In this sense, the present paper intends to investigate the behavior of a full-converter wind generator with a permanent magnet synchronous machine during symmetrical and asymmetrical voltage sags. Two solutions to improve the low voltage ride-through capability (LVRT) of this technology are analyzed: discharging resistors (brake chopper) and resonant controllers (RCs). The design and limitations of these solutions and the others proposed in the literature are discussed. Experimental results in a 34 kW test bench, which represents a scaled prototype of a real 2 MW wind conversion system, are presented.
Highlights
Modern grid codes around the world require that wind energy conversion systems (WECS)remain connected to the grid during voltage sags [1]
The experimental results for the symmetrical voltage sags show that the capability of the system to ride‐through the event lies in the chopper capability of dissipating the power not supplied to the grid
This is the traditional low voltage ride-through capability (LVRT) strategy employed in FC‐permanent magnet synchronous synchronous generators generators (PMSG) WECS
Summary
Modern grid codes around the world require that wind energy conversion systems (WECS). Purpose, Yang et al [15] proposes the reduction of the generator active power reference during the voltage sag The of this strategy is the generator/turbine speed increase, sinceduring the surplus energysag. Yangdrawback et al [15] proposes the reduction of the generator active power reference the voltage The drawback of this strategy is the generator/turbine speed increase, since the surplus energy is stored as kineticofenergy in the turbine. The present paper performs a complete analysis of the RTFC problem of PMSG wind conversion system using a full scale converter (FC-PMSG) It is addressed the behavior of the classical dq-axes current control using braking resistors during symmetrical and asymmetrical voltage sags. The basic modeling of the main components and the classical control strategy are described in the following subsections, as well as the scaled test bench
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